Definition of periuranium in English:

periuranium

noun

Astronomy
rare
  • The point in the path of a celestial object or spacecraft orbiting (or passing) Uranus at which it is nearest to the planet.

Origin

Late 19th century; earliest use found in The New English Dictionary. From peri- + Uranus + scientific Latin -ium, after perisaturnium.

Pronunciation

periuranium

/ˌpɛrɪjʊˈreɪnɪəm/